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Density functional theory calculations, flotation behavior, X-ray photoelectron spectroscopy, and infrared spectra were combined to reveal the Cu2+ activation mechanism on a cyanide (CN−)-leached sphalerite surface. Low CN− adsorption enhanced the activation capability of Cu2+ on the sphalerite surface, whereas the hydrophilicity of the sphalerite increased with increasing CN− coverage, which hindered...
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